Apparatus for bending metal bars particularly applicable to concrete reenforcement



Oct. 3l, 1933. F. scHLAGlNTwElT APPARATUS FOR BENDING METAL BARS PARTICULARLY APPLICABLE TO CONCRETE REENFORGEMENT Y 2 Sheets-Sheet l Filed May 10, 1952 INV E N TOR fJC/I/AG//Vwf/f B yl HTTORNE Y Oct. 31, 1933. F. scHLAGlNTwElT 1,933,189,

APPARATUS FOR BENDING METAL BARS PARTICULRLY A?PLICABLE TO CONCRETE REENFORCEMENT Filed May l0, 1932 2 Sheets-Sheet 2 Fig. 2.

HTTOR NE Y Patented Oct. 31, 1933 l"Al'lnum'rns Fon" BEND'ING METAL BARS f PARTICULARLY APPLICABLE` TO CRETE` REENFORCEMEN'I CON- 1 Fn'ee'rich sehiagintweit, Bademaaen, Germany, f assigner to Rapag A.-G.', Haus4 Folsenau, kllergiswil-on-theSee, Switzerland f yAp'plicatimu May 10,1932, serial Nationen, and .l l.

in aGreat Britain .July' 7, 1931 .8 Claims. (Cl. 14th-'11) The invention relates to means for the mann-v facture of '.frames,i particularly applicable for concrete reenforcement consisting of two parallel main bars and. cross-wires or transverse bars wound-at intervals between these ,main

bars.` v*Hitherto it has been customary to produce framework of this" kind yby winding the cross-Wires round the two parallel4 barsbyhand c or by providing both ends of theV cross-wires.

withscoils for the accomodation ofthe vbars by .mechanical means vand A afterwards pushing the Wires on Yto `'the bars.l In the former case therconstruction of the reenforcements is tedious and expensive and, in additiomit is verydifiifl cult :to keep the space rbetween the twoparallel -bars f exactly uniform vthroughout their.

length.. In'the latter case the mechanically produced coils 'of thev cross-wires must have a larger inside diameter v.than thexdiameter of the parallel bars, so as to enable .them tobe pushedon` to. the bars. Apart .from ther tediousness vof this process, it alsoy involves. 'the serious ineenvenience that the cross-wiresV arenot immovably fixed on` the parallel bars` and canbe displaced slantwise, Vfor example, when the concrete is being rammed.. v

It has already been proposed to. coil the ends of theV cross-Wires-roundgthe parallelbars in the' same direction by amaohine whichrnecessitated the use of a specialdevicefor each'particular distancebetween the parallel bars.

This invention eliminates theseinconveniences by the provision of a simple machine provided. with two coiling heads surrounding guide .sleeves l through which the main barslare passed land rotated in opposite directionsmuchin the. same manner asobtained with the complicated machines at` present in .usevfor making wide wire fabrics with,` `a large number .offiongitudinal wires vand withcross wires coiled between them.

In ythe improved machine which 'constitutes the invention one` sleeve -is displ'aceablelongiy tudinally in a guide formed Viin the`V machine casing'and is provided with meansfor causing the driving gear-to move withit in relation to the-driving shaft. 'The displaceable #sleeve 4is provided with a. rod running parallelfto the. guide and is fitted with a handle `for longitudinal ad-y justment and means for locking itin various po# sitions... y

yother` mamiesvof thpmachme'epasisg ,th

use of eccentrically mounted'rollersin theeolingheads vfor .engaging the wire to :be coiled and liners rto the sleeves vtoA accommodate barsofgvarying diameten y ,l

In Vthe accompanying.l drawings which illustrate in diagrammaticmanner a=preferred embodiment of the invention, s n s l Fig. 1 shows the apparatus infront elevation.

Fig. 2 is a. section along the line .2-2. in Fig. 1.

=Figs. 4 and show Ythe sliding blockfserving vas the bearing for one of the guidesleeves, in y front elevation and side elevation respectively.

\ Figure illustrates the kind of framewhich Athe ,machine is intended to' make,

In acasing a, the rear-wall a1 of which@isfrde'f-Ay l tachable and is held in position by boltsb, a shaftc is arranged. shaft c is supported in the end Walls of the casing a. which are provided with suitable bearing attachments d1 and d2, and carries a `hand crank e, on the end pro-,

jecting from the casing..M Inside the casing a n theY shaft c carries two Worms or screw wheels]1 and lf2, at a certain distance apart, 'which by means of feathers (keys) `g1 'and g2` are driven` i by. theshaftin the'directionof rotation. One

-Worm .wheel f2, is-for apurp'ose which shall be explained in moreV detail later-arranged so as to bedisplaceablevwith "its feather g2' in a' longitudinal groove c1 of theshaft c. The-two. Wormsor'screw wheels f1 and 72V engage" withA two worm wheels or screw wheels h1 and h2.fixed on two rotatable sleeves orbushes il, i? and arranged `underneaththe shaft c"with` axes at `right angles `tothe axis of the shaft c. .The worm or screw-threads of the'wheels fk'hlpitch in oppo".` site ydirectionsgto the worm or lscrew-threadsA of the wheels 1f, Thi, soi-thaty byturningthe shaft yc by means of thefhandv crank e the twosleevesor The Asleeve li1A 'is carried in a fixed bearingat` tachment Ic of the casing yci, while the-sleeve i2 isrpositionedin a special block 'consisting of twov parts .11, Z2, yleavingabetweenathesm groovesl6 which are displaceable in guides m arrangedV in the front wall vof the casing a, parallelto fthev Yshaft c. The displacer'nentlof the block 4,is ef,-A

' bushes 1'1, i2.are `rotated in opposite, directions. Y

fected by a rod Z3 acting thereon, which rod extends through a bearing attachment d, serving as guide in the one end wall of the casing a, and is provided with a handle Z4 on the outer end. This rod Z3 is provided with several consecutive bore-holes Z5 which can on the displacement of the rod be brought consecutively into register with a bore-hole in the guide d3 .larger or smaller internal diameter.

accommodating a pin or a screw la, so that by means of the pin l, the rod l3 can be locked in various positions. `Thus the sleeve i2 can be adjusted at different distances from the sleeve?.

The sleeves i1 and i2 serve as guides for the parallel bars used for the manufacture of the rescrew-wheel f2, so that on the displacement of` the block Z1, l2 the worm or the screw-wheel f2 is also displaced along the shaft c.

' The guide sleeves i1, i forthe parallel tensioning bars and compressive bars are each provided on their front ends lwith an eccentrically mounted coiler o1 and o2 respectively. Eachcoiler consists of a screw inserted in the front end of the sleeve in question and a rollerpreferably of hardened steel, surrounding the outer portion' of the screw and the screw head. The purpose of these drivers is to engage the ends of the crosswires, which are applied from above or below across the pair of' the parallel bars passing through the sleeves i1, i2 with the ends of the cross-wires projecting beyond the bars and coil them round these bars. 'When, for example, a cross-wire is applied from above to the bars carried by the sleeves i1 and i2, the sleeve i1Y must be rotated clockwise and the sleeve i2 anticlockwise, so' that the ends of the cross-wire are wound round the parallel bars in opposite directions. Each of the sleeves i1 and il is providedon its front end with a helicoidal surface p1 and p2 respectively which pitches in an opposite direction to the vdirection of rotation of the sleeve. On winding the ends of the cross-wire resting against this helicoidal surface round the bars carried by the sleeves"i1, i2 the. cross-Wire is pushed forward in the direction of theY bars in such a manner that the turns produced in the cross-wire are placed one beside the otherl andl do not interfere with one another.

As soon as a cross-wire has been wound round the bars carried by the -sleeves i1 and i2, these bars are pushed forward by hand conjointly through the sleeves i1, i2, to the extent required for the purpose of applying the next cross-wire. In cases Where a larger .or smaller space is required between the parallel bars ofthe reenforcements or the like whichv are to be' manufactured, the block Z1, Z2 together with the sleeve il is pushed to the left or to the right by'means of the rod'l3 andisr lockedA in the' position desired at any time by means of the pin or the screw Z8. I clai'm:--y f' 1. A machine for forming metal frames of the character designated comprising' in combination, two parallel sleeves, each permitting the passage of one of the main bars, coiling rollers carried eccentrically at the ends of `said sleeves and gearing for driving said coiling rollers in opposite directions.

2. A machine for forming metal frames of the character designated comprising in combination, two parallel sleeves, each permitting the passage of one of the main bars, coiling members carried at the ends of said sleeves, gearing for driving said coil members in opposite directions, and a limb attached to one of said sleeves and engaging the driving gear therefor, said limb causing said driving gear to move transversely when said sleeve is so moved.

3. A machine for forming metal frames of the character designated comprising in combination av casing, a shaft having bearings in the upper part of said casing and having one end projecting therefrom, a driving handle on said projectingend, gear wheels mounted on said shaft in sliding relation, two parallel sleeves mounted in said casingbelow said shaft and at right angles thereto, coiling means carried by said sleeves and gear wheels carried by said sleeves and in engagement with the gear wheels before mentioned, said gear wheels being so arranged that the sleeves are rotated in opposite directions.

4. A machine for forming metal frames ofthe character designated comprising in combination two parallel sleeves, each permitting the passage of one of the main bars, coiling members carried at Athe ends of said sleeves, a driving shaft transverse-to said sleeves, toothed-gearing between'for driving said coiling members in opposite directions from said driving shaft, a transverse guide for one of said sleeves parallel to said driving shaft, and means for moving-'said sleeve 4in said transverse guide and for causing the drivingA gear to move therewith and to slide along said drivingH shaft.

5. A machine for forming metal frames of the character designated comprising in combination two parallel sleeves, each permitting the passage of one of the main bars, coilingmembers carried at the ends of said sleeves, a driving shaft transverse to said sleeves, toothed gearing between for driving said coiling -members in. opposite directions from said driving shaft, a transverse guide for one of said sleeves parallel to said driving shaft, a handle connectedto one of said sleeves for moving said sleeve in said transverse guide, and means for locking said handle in adjusted position. v .6. Amachine for forming metal frames of the character designated comprising in combination two parallel sleeves, each permitting the passage of one ofthe main bars, coiling members carried at -theends of said sleeves, a driving shaft transverse-to said sleeves, toothed gearing between for driving said coilingY members in opposite directions from said driving shaft,`a transverse guide for one of said sleeves parallel to said driving shaft, and removable liners in said sleeves to accommodate main bars of varying diameter.

` 7. A machine for forming metal frames vof the character designated comprising in combinationV two parallel sleeves, each permitting the passageof one of the main bars, coiling members carried at the ends ofv said sleeves, a driving shaft transverse to said sleevestoothed gearing between for driving said coiling members in opposite directions from said driving shaft, a transverse guide for one of said sleeves parallel to said driving shaft, a casing enclosing said sleeves and driving shaft, a guide formed as an kprising a casing, ceiling means carried stationary in said casing, a second coiling 4means slidably mounted in said casing, means associated with each of said coiling means to receive a frame bar about which a Wire may be` coiled by said coiling means, said second coiling means being adjustable with relation to the rst, and stationtry ceiling means to vary the distance between a therframe bars.

FRrEDRIcH SCHLAGINTWEIT. 

